Stick tool holder

ABSTRACT

A tool that can be mounted and clamped in the circle tool receptacle of automatic screw machines and allows the holding and use of square shanked lathe tools. The technologically advanced tooling systems that are available to the computerized, numerically controlled machine industry are all square shanked and will now be available to the screw machine industry.

FIELD OF THE INVENTION

[0001] The present invention relates to a holder for allowing the use of square shanked tooling on screw machines.

[0002] Traditionally, automatic machines of this type use a circular disc form tool to shape and form the part being made to its correct size.

[0003] These circular form tools are a major cost concern when evaluating the profitability of any given job.

[0004] The Stick Tool Holder allows the use of a standard square shanked lathe tools to be used in place of the circular form tools. The cost of this lathe tool is a fraction of the circular form tool's cost. FIG. 4.

[0005] The Stick Tool Holder has a clearance cut which allows work to be done much closer to the collet chuck. The Holder also has tapper control of the tool bit without which the tool bit has to be reground to remove any unwanted taper that may exist on the finished part. There is also a cover plate which prohibits spreading of the Holder due to the clamping pressure holding the tool bit in place.

[0006] Accordingly, there exists a need for a reliable, convenient, adjustable holder that allows the use of square shanked lathe tools, carbide tipped or high-speed steel to be used on automatic screw machines.

DESCRIPTION OF THE RELATED ART

[0007] Several holders for this purpose can be found in the prior art. One such prior art holder designated the “KWIK FORM TOOL BIT HOLDER” can be seen in FIG. 5 This holder can only accommodate a ⅜ square tool bit in the Davenport Machine. Also, this holder does not have a cover plate to stop the spreading action caused by the clamping pressure on the tool bit. The holder has an excessively thick body web between the top and bottom of the tool bit opening to help stop the spreading problem. This thickness, however, creates another problem, doing work close to the collet chuck is difficult at best and this is very important in small diameter work as the part has a tendency to flex away from the cutting tool causing a taper problem.

[0008] Another prior art holder is sold under the designation “Flat Form Tool Circular Holder.” This holder can be seen in FIG. 6 and even though made by a different manufacturer suffers the exact same problems as the previously discussed holder.

[0009] While prior art devices are to some extent effective in allowing the use of stick tools in screw machines there is a definite need for a holder that will allow the use of larger tool bits, will not spread apart due to clamping pressure, will allow close to the collet work, and will allow taper adjustment to the tool bit.

SUMMARY OF THE INVENTION

[0010] The above objects and advantages of the invention are accomplished by a holder that can be secured in a circle tool receptacle of an automatic screw machine and then allow square shanked lathe tools, carbide tipped or otherwise, to be used.

[0011] The Stick Tool Holder has a cover plate which stops the spreading action caused by the pressure of the clamping bolts as they secure the square shanked tool bit in place. Because of this cover plate, the back side of the Holder can be thinned to a minimum and with a clearance cut, work can be done on parts right next to the collet chuck.

[0012] There are two adjusting screws in the cover plate that make contact with the side of the square shanked tool bit. On the opposite side of the tool bit, half way between the two adjusting screws is the domed head of a rivet mounted in the Holder body. This rivet head allows the rocking action of the tool bit by the adjustment of the two screws in the cover plate. This adjustment allows taper control to be accomplished without regrinding of the tool bit.

[0013] Accordingly, the major cost of circular form tools and the regrinding of the tools to control taper will no longer be a problem.

[0014] The Stick Tool Holder also has the correct locating diameters and the engagement pin for the circle tool receptacles center line controlling mechanism known as the half moon gear.

[0015] In summation, there exists a need for a holder that will allow taper control and the use of all the square shanked tooling that is available in the metal working industry to be used on automatic screw machines.

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above object's advantages and features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings in which:

[0017]FIG. 1 is a pictorial view of the Stick Tool Holder, front and rear sides.

[0018]FIG. 2 is a single line drawing showing the front, the side and the rear view of the Stick Tool Holder body.

[0019]FIG. 3 is a single line drawing showing the Stick Tool Holder cover plate, front and side view.

[0020]FIG. 4 is by comparison, showing the cost of the circular form tool blanks as compared to the cost of carbide tipped, square shanked lathe tools.

[0021]FIG. 5 is an example of related art.

[0022]FIG. 6 is a different manufacturers example of related art.

[0023] Referring now to the drawings, particularly FIGS. 1 through 3, the tool of the present invention includes a locating diameter 11, threaded or otherwise that centers the Stick Tool Holder 4 in its mounting apparatus whether it be a swing arm or a slide. The Stick Tool Holder 4 also has a locating pin 16 of sufficient size to engage with the half moon adjustable rotation gear to adjust center line of the work being machined with the cutting edge of the stick tool. It has a clearance cut 13 on the back side that allows the stick tool to be adjusted as close as possible to the machine's collet chuck allowing the complete use of the machine's length capabilities. It also has a clearance cut 17 on the front side allowing the cutting tool edge to be placed at the proper location, “at the circumference line” as this is necessary for the machine to function properly. It has an appropriate number of hold down screws 22 of sufficient size to secure the stick tool 10 in the Holder. The Stick Tool Holder 4 also has a front cover plate 26 mounted to the body 25 of the Holder by an appropriate number of screws 30 which keep the body 25 of the Holder from spreading apart due to the clamping pressure of the hold down screws 22. The Holder has taper adjustment consisting of adjusting screws 27 in the corner plate 26 that intersect the stick tool on either side of its length center line which is rocking on the head of a domed rivet 29 on the opposite side of the stick tool located in a hole in the Tool Holder body 25. All screw and rivet contact are on the ½ inch stick tool's thickness center line. The outside diameter is consistent with whatever diameter circle tool the automatic screw machine is designed to use. The cover plate 26 has sufficient unused surface 31 to accommodate the marking or labeling of the manufacturer's name for identification purposes. The cover plate 26 mounting screws are of the countersunk variety as they allow absolutely no movement or spread of the holder body 25. The hold down screws 22 are of the square head variety as this is consistent with the screw machine industry. The Stick Tool Holder 4 is made of heat treated alloy steel fashioned from round bar stock, sawed into pieces, faced, drilled, bored and reamed on the lathe. Slots and clearance cuts are milled, then the Holder is drilled, tapped and countersunk, stamped, heat treated, black oxided, surfaces ground, and then assembled.

[0024] While the principles of the invention have been made clear in the illustration embodiments set forth above, it will be obvious to those skilled in the art to make various modifications to the structure, arrangement, proportion, elements, materials and components used in the practice of the invention to the extent that these various modifications do not depart from the spirit and scope of the appended claims, rather, they are intended to be encompassed therein. 

I claim:
 1. A tool for allowing the use of square shanked tooling to be mounted, adjusted, and used in the circle tool mounting receptacles of automatic screw machines comprising: (a) a main body. (b) a cover plate bolted to the main body (c) various bolts, screws, and pins for clamping, adjusting and securing the components of the Stick Tool Holder.
 2. The tool of claim 1 includes a means for adjusting the square shanked tool bit to control taper on the finished part.
 3. The tool of claim 1 wherein the cover plate is mounted to the main body to control spreading due to the clamping pressure on the square shanked stick tool bit.
 4. The tool of claim 1 wherein a center locating bore is utilized to control rotation of the Stick Tool Holder to establish center line contact between the part being made and the stick tool's cutting edge.
 5. The tool of claim 1 wherein an engagement pin is utilized to adjust the rotation of the Stick Tool Holder by the mechanism incorporated in the circle tool receptacle of the machine.
 6. The tool of claim 1 further including a clearance cut on the back side of the Stick Tool Holder body to allow close to the collet work.
 7. The tool of claim 1 further including a clearance cut to allow the cutting edge to be on the circumference line where the normal circle tool's cutting edge would be.
 8. The tool of claim 1 wherein said mounting of the corner plate is accomplished with countersunk screws which prohibit it any movement due to clamping pressure.
 9. The tool of claim 1 wherein said cover plate is designed to allow space for the manufacturer's identification.
 10. The tool of claim 1 wherein said tool body and cover plate are made of heat treated alloy steel. 